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Browsing by Author "Glazer, Jean Patricia"

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The 2006 operational management procedure for the South African Merluccius paradoxus and M. capensis resources

Author: Rademeyer, Rebecca A ; Glazer, Jean Patricia Date: 2006 The algorithm for the 2006 Operational Management Procedure (OMP) to provide TAC recommendations for the South African Merluccius paradoxus and M. capensis resources is empirical, increasing or decreasing the TAC in relation to the magnitude ... Read more
The 2010 operational management procedure for the South African Merluccius paradoxus and M.?capensis resources

Author: Rademeyer, Rebecca A ; Fairweather, T ; Glazer, Jean Patricia ; Leslie, R L ; Butterworth, Doug S Date: 2010 The algorithm for the 2010 Operational Management Procedure (OMP) to provide TAC recommendations for the South African Merluccius paradoxus and M. capensis resources is empirical. It combines an increase or decrease of the TAC in relation to ... Read more
Alternative calculation of catches per Area in the South Coast rock lobster fishery

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2008 A method to separate the South Coast rock lobster annual catches by Area for the areadisaggregated assessments was described in WG/04/08/SCRL08. Concern was raised about an assumption made with respect to the calculation of those catches, ... Read more
The application of a generalized linear mixed model to the Area 8 bakkie data

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2011 A Generalized Linear Mixed Model (GLMM) has been applied to the Area 8 bakkie CPUE data. The intention was to include data from Areas 10, 11 and East of Hangklip (Areas 12-14) in the analyses and to include subarea as a factor in the model, ... Read more
The application of a generalized linear mixed model to the Area 8+ trapboat data

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2011 Two papers by Glazer and Butterworth (2011a, 2011b) were recently submitted to the West Coast Rock Lobster Scientific Working Group meeting for consideration. The first of those included sub-area as an explanatory variable in a Generalized ... Read more
The application of general linear modelling methods to estimate trends in abundance of the hake and rock lobster stocks off South Africa

Author: Glazer, Jean Patricia Date: 1999 The two species of Cape hake, Merluccius capensis (shallow-water hake) and M paradoxus (deepwater hake), fomi the mainstay of the bottom trawl industry off South Africa and constitute the country's most valuable fishery. It is therefore ... Read more
A Bayesian analysis of the squid resource Loligo reynaudii

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2012 A Bayesian assessment of the squid resource was last performed in 2010. This paper presents results from an updated Bayesian assessment given that additional years’ data are now available. Read more
A comparison of the catch and fishing day statistics from the squid LTRAMP and NMLS databases

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2006 Long-term rights were recently allocated to 109 companies with a total of 123 vessels in the squid jig fishery. An exercise was conducted to compare information provided in the LTRAMP application forms with that which is captured on the ... Read more
Considerations for effort restrictions in 2007 in the South African jig fishery

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2006 It is proposed that effort in the jig fishery be curbed, and that the reduction in effort be effected by restricting each vessel to a vessel-dependent number of days at sea each year. The vessel-dependent numbers may be based upon the relative ... Read more
A conversion of squid effort from hours to man-days and some related considerations

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2006 The South African jig squid fishery is a constant effort fishery, with the current unit of effort being one of man-hours. The target effort level is 3030 thousand man-hours based on recent assessment results, and the mechanism of effort control ... Read more
An experimental assessment of the impact of gear saturation on an abundance index for an exploited rock lobster resource

Author: Groeneveld, Johan Conrad ; Butterworth, Doug S ; Glazer, Jean Patricia ; Branch, George M ; Cockcroft, Andrew C Date: 2003 Increased fishing effort may downwardly bias indices of abundance, such as catch-per-unit-effort (CPUE), due to gear saturation. A field experiment was developed to assess gear-saturation effects on an index of relative abundance used for ... Read more
Further analyses of the GLM trends for M. paradoxus and M. capensis

Author: Glazer, Jean Patricia ; Butterworth, Doug S ; Leslie, R W Date: 2008 This paper takes a closer look at CPUE analyses, particularly with a view towards determining the reason for the sharp decline in the standardized CPUE index from 2006 to 2007 for M. capensis. Results from including and excluding night-time ... Read more
Further squid assessment and projection results for a Bayesian approach to take account of uncertainty in parameter values

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2013 The squid stock assessment model has recently been updated to be based upon the Baranov catch equations rather than the Pope catch equations used in past analyses as advised by the Panel from the International Stock Assessment Meeting held ... Read more
Further squid statistics relevant to the data cleaning process

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2008 At the squid working group meeting held on 4 July 2008, the following further information was requested to inform the data cleaning process: • Distribution of fishing days for each of the 12 vessels identified by Industry in MCM/2008/July/SWG-SQ/01 ... Read more
A Generalized Linear Model applied to the South Cost rock lobster CPUE data to obtain area-specific indices of abundance

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2008 Area-disaggregated assessments for South Coast rock lobster are currently being developed. An important input to these assessments is the catch per unit effort (CPUE) data. A Generalized Linear Model (GLM) has been applied to the data to ... Read more
The inclusion of sub-areas in the standardisation of the Area 8 trapboat CPUE data through the application of a generalised linear mixed model

Author: Glazer, Jean Patricia ; Butterworth, Doug S Date: 2011 Data for the West Coast rock lobster Areas are available at a sub-area level from 1992. The data are fairly patchy at a sub-area level for most areas other than Area 8 for trapboats and Area 1 for bakkies. This paper presents preliminary ... Read more
OMP 2007 re-cast to be used for setting TACs for the West Coast rock lobster fishery for the 2008+ seasons

Author: Johnston, Susan J ; Butterworth, Doug S ; Glazer, Jean Patricia Date: 2010 This document first gives the reasons why the OMP agreed for West Coast rock lobster in 2007 (OMP-2007) was “re-cast” the following year, listing the modifications then introduced. It then provides details of the three main components of ... Read more
OMP 2008 for South Coast rock lobster resource

Author: Johnston, Susan J ; Butterworth, Doug S ; Glazer, Jean Patricia Date: 2008 OMP 2008 consists of an algorithm that calculates the TAC for the resource using CPUE data collected from each of three areas (New Areas 1, 2 and 3 – see Fig. 1), Note that the TAC for season y+1 will be based upon the CPUE series that ends ... Read more
OMP 2011 to be used for setting TACs for the west coast rock lobster fishery for the 2011+ seasons

Author: Johnston, Susan J ; Butterworth, Doug S ; Glazer, Jean Patricia ; Brandão, Anabela Date: 2012 This document provides full specifications of OMP 2011 to be used to set allocations for various sectors and super-areas for the 2011+ seasons for the West Coast rock lobster fishery. This OMP is implemented slightly differently for the first ... Read more
A preliminary assessment of the South African east coast sole resource, Austroglossus pectoralis

Author: Butterworth, Doug S ; Glazer, Jean Patricia Date: 2014 Currently the Agulhas sole resource is managed by a Total Allowable Catch (TAC) which, for 2014, was set at 872 tons. Concern was expressed in the 2013 sole TAC recommendation regarding the fact that catches have, since 2002, been consistently ... Read more

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